Remove legacy VNDK.
This is using the legacy version of the VNDK which can lead to
build consistency errors. It is better to not have it until
BOARD_VNDK_VERSION := current can be turned on this device.
Bug: 69526027
Test: multiproduct_kati - generic devices either
have BOARD_VNDK_VERSION or !PRODUCT_TREBLE_LINKER_NAMESPACES
Test: google emulator arm64 (one target that gets the change applied)
boot complete
Change-Id: I72215abf2765e84f42fd5880ae5f56e99d9e0e75